"220V Cooling Fan" ball changed the way of bearing friction, rolling friction, the two balls or hoops middle of some steel columns, supported by some of the grease. This approach is more effective in reducing the friction between the bearing surface phenomenon, effectively increasing the "220V Cooling Fan" bearing life, and therefore decrease the amount of heat sink, longer life. The disadvantage is brought about by the process is more complex, resulting in cost increase, but it also brings higher operating noise. "220V Cooling Fan" auxiliary cooling function with precision instruments to improve more and more important. So choose a good instrument in terms of the cooling fan is very important.